Guide To P208F OBD Error Code Solutions

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Learn More About OBD Error Code P208F The prime symptom of the OBD code P208F is the increased emissions in the exhaust system. This not only increases pollutant emissions, but will also hamper the performance of the vehicle with affected utilization of the fuel delivery system. If the reductant injection valve performance is out of bounds, OBD code P208F gets stored in the PCM.

The entire SCR system is monitored and controlled by either the PCM or a stand-alone controller (which interacts with the PCM). Either way, the controller monitors the O2, NOx, and exhaust temperature sensors (as well as other inputs) to determine the appropriate time for DEF (reductant) injection. Precise DEF injection is necessary to maintain exhaust temperature within acceptable parameters and optimize pollutant filtration. Reductant heaters are used to prevent diesel exhaust fluid from freezing during extreme temperatures. These heaters are typically located in the DEF reservoir and/or the reductant injector supply hose/s. If the PCM detects no voltage on the control circuit for the reductant injection valve for engine bank two unit one, a code P208F will be stored and a malfunction indicator lamp may be illuminated.

What causes this problem with the Reductant Injection Valve Stuck Closed Bank 2 Unit 1?

• Bad reductant injection valve
• Open or shorted circuits in the reductant injection control system
• Bad SCR controller/PCM or programming error

1. Engine Control Module – Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
2. Powertrain Control Module – If the PCM is faulty, it can stores wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus replace it immediately.
3. Diagnostic Tools – Use factory grade diagnostic tools to resolve OBD code P208F error. Buy new diagnostic tools and equipment for us.
4. Diesel Particulate Filter – The diesel particulate filter acts as an important component in managing the particulate emission in the exhaust system. If the filter is damaged, it may lead to increased emissions and pollutants through the tailpipe. Thus, replace damaged filter now!
5. Diesel Exhaust Fluid Heater – If the diesel exhaust fluid heater is faulty, it will not be able to aid in conversion of harmful nitrous oxide compounds to nitrogen, carbon dioxide and water vapours to control emissions. Thus, replace it immediately.
6. Exhaust System - Your exhaust system begins at the engine with the purpose of removing toxic gases and fumes from your vehicle. The components are a series of pipes, catalytic converters, sensors, mufflers, and often a resonator, as well as other emission devices. Thus, replace damaged exhaust system now!

If you are facing OBD error code P208F, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• Reduction in fuel efficiency
• Excessive black smoke from vehicle exhaust
• Diminished engine performance
• Other SCR related codes

It is very important to fix the fault code P208F. So here are some ways with which you can correct this issue:

• Diesel Exhaust Fluid Heater replacement
• Diesel Particulate Filter replacement
• Exhaust System replacement
• Faulty Reductant Injection valve replacement
• Faulty wiring and connector issue
• PCM repair and reprogramming

However, if you face any issue then we have stocked a wide range of best priced Powertrain Control Module, Reductant Injection, Valve, Diesel Exhaust Fluid, Exhaust System, Injector, Oil Control Valve and more to help you out in fixing your car.

If you want to easily diagnose this P208F fault code, then all you have to do is to follow the steps which are mentioned below:

• Hook up a scan tool to the DLC port and check for any codes present.
• Note the codes and freeze frame data from all the codes.
• Clear the stored codes from the ECU.
• Perform a road test under similar conditions as the freeze frame data indicated.
• Check that the P208F is the code that has come back after the test drive.
• A visual inspection will be done looking for signs of exhaust leaks or damaged wiring for either the sensor itself of the harness.
• Using a multimeter, the OHMs will be checked to the exhaust gas temperature sensor.
• The vehicle will be ran and the presence of exhaust leaks will be checked.

Common Mistakes When Diagnosing the P208F Code

• Faulty Powertrain Control Module (PCM)
• Failed Reductant Injection valve
• Failed Reductant Injection control system
• Wiring harness and connector issue

P208E - Reductant Injection Valve Stuck Closed Bank 1 Unit 1